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Old February 1st, 2015, 05:41 PM
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Default RO at 130 PSI?

I have a goulds booster pump that will pump about 10 gpm at 90 psi. I figured if I feed this with a shallow well pump at 50 PSI it should be about 130 to 140 psi.

I planned on feeding a 4x40 membrane (XLE maybe) rated for max flow of 14 gpm. I'm not hoping for 8 percent sap, thinking I could get to 6 after a few passes. Think this would work? How many gallons of permeate would you expect per hour?
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Old February 1st, 2015, 07:02 PM
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90# is your final psi.....
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Old February 1st, 2015, 08:24 PM
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Final pressure is actually in the 130+ range. What does that pump max at for pressure / gpm?

This is how my old r/o was built. Had a 1/2 hp clear water pump that fed a goulds multistage 1hp pump that maxed about 190 psi. It would let me push close to 300psi.

The goulds pump pressure rate is based on 0 psi input and giving you how much pressure increase you will get. So if you start with 80 psi, and the pump will push 120 psi @5gpm, your pump output pressure should be close to 200 psi leaving the pump @5gpm.
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Old February 1st, 2015, 09:22 PM
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Pretty sure it goes just at 100 psi at minimum flow 6GPM according to the curve. That's what I figured with the suction head of 50 psi or so from a feed pump is ~150psi at the most.

Not sure what minimum flow is for a 4x40 membrane?

The booster pump is rated at max suction of 75 psi. Is there a good feed pump that can manage this? That would get me up around 175.

Like I said I can recirc some to get % up a little. I already have the pump, just wish it had a few more stages to get pressure up. wondering if it is worth putting something together?
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Old February 1st, 2015, 10:30 PM
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Always worth putting something together. Xle and nf270 max without membrane recirculation in the 150 psi area. You can push them Higher, but you wont get much more water per min out of your sap. For a 50% reduction, you will have about 1 gpm permeate and 1 gpm concentrate..
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Old February 2nd, 2015, 04:55 AM
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I guess I do not quite understand. If the max flow through the membrane is for example 14 gpm and I pumped that through it seems I would have to get that out?
Maybe 13 gpm concentrate and 1 gpm permeate? That would be 60 gph water removal?

my pump says do not go below 6 gpm so I guess the 1 and 1 ratio confuses me? Can you explain this on your experience and pump size you have?
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Old February 2nd, 2015, 11:30 AM
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14 gpm is max flow cross the membrane surface without damaging the membrane. 60gph is about the max for 4x40 membrane without recirculation.
The pump I had was a 7gbs10fs. It would only run 1 membrane.
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Last edited by sapaholic; February 2nd, 2015 at 11:53 AM.
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Old February 2nd, 2015, 04:09 PM
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I have an 18gb, I guess over twice the flow of the 7gb. Think I would be able to run 2 membranes off this? Maybe remove 100 GPH.
Did yours have a recirculation pump? Or did you just recirculate back to the suction of hp pump.

I am not sure what a recirculation pump actually does and how it is plumbed?
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Old February 2nd, 2015, 05:48 PM
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I had no recirculation. Recirculation allows you to keep high flow across the membrane to keep it from fouling as fastn whuch will increase your gph of permeate.
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Old February 2nd, 2015, 07:10 PM
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Thanks. going to try to build this for next year. I have wasted more money on less over the years I am sure. Funny thing will be if I put 250 taps out and it does not work. I'll be swimming.
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